body{
    width: 1920px;
    height: 1080px;
    padding: 0;
    margin: 0;
    overflow:hidden;
    background: url("../img/woniu_tuoyuan@2x.png") no-repeat right top;
    background-size: 457.2px 390.5px;
    background-color: #F2F2F2;
}
.heard{
    width: 1645px;
    margin-left: 137px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}
.right-top{
    display: flex;
    flex-direction: row;
    margin-right: 90px;
}
.heard-item{
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #FFFFFF;
    font-size: 20px;
    margin-left: 30px;
    margin-top: 61px;
}
.content{
    background-color: #FFFFFF;
    border-radius: 30px 30px 0px 0px;
    box-shadow: 3px 13px 13px #D2D2D2;
    width: 1646px;
    height: 898px;
    margin-left: 137px;
    margin-top: 51px;
    z-index: 999;
}

.navigation{
    position: absolute;
    top: 143px;
    left: 1500px;
    display: none;
}
.navigation-top{
    width: 0px;                           /*设置宽高为0，所以div的内容为空，从才能形成三角形尖角*/
    height: 0px;
    border-bottom: 18px solid #F58220;
    border-left: 42px solid transparent;    /*transparent 表示透明*/
    border-right: 42px solid transparent;
    margin-left: 102px;
}
.navigation-content{
    width: 288px;
    border-radius: 10px;
    background-color: rgba(245, 130, 32, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #FFFFFF;
    padding: 51px 0 32px 0;
}
.navigation-item{
    display: flex;
    flex-direction: row;
    font-size: 26px;
    align-items: center;
    padding: 21px 0;
}
.navigation-heng{
    height: 2px;
    background-color: rgba(247, 247, 247, 0.4);
    width: 194px;
    border-radius: 100px;
}
.foot{
    font-size: 15px;
    width: 100%;
    text-align: center;
    position: absolute;
    bottom: 21px;
    color: #A4A4A4;
}